Block CIM types and new CimFS API wrappers

CimFS now supports a new format for storing CIMs, named BlockCIM.  A block CIM format can
store the entire CIM on a block device (like a VHD) or a file formatted like a block
device.

This commit adds Go wrappers for the new CimFS APIs that allow creation, merging and
mounting of such Block CIMs. Some new flags required when creating and mounting these CIMs
are added and some deprecated flags have been removed. New type has been introduced to
represent a block CIM. Unit tests have been added to test the newly added CimFS
functionality. Lastly, CimFS flags aren't a part of the hcs schema (only the CimMount
request is), those flags are moved from the hcs/schema2 package to the cimfs package.

Signed-off-by: Amit Barve <[email protected]>

internal/hcs/schema2/cim_mount.go → internal/hcs/schema2/cimfs.go

@@ -9,14 +9,6 @@
 
 package hcsschema
 
-const (
-	CimMountFlagNone         uint32 = 0x0
-	CimMountFlagChildOnly    uint32 = 0x1
-	CimMountFlagEnableDax    uint32 = 0x2
-	CimMountFlagCacheFiles   uint32 = 0x4
-	CimMountFlagCacheRegions uint32 = 0x8
-)
-
 type CimMount struct {
 	ImagePath      string `json:"ImagePath,omitempty"`
 	FileSystemName string `json:"FileSystemName,omitempty"`

internal/winapi/cimfs.go

@@ -32,11 +32,17 @@ type CimFsFileMetadata struct {
 	EACount            uint32
 }
 
+type CimFsImagePath struct {
+	ImageDir  *uint16
+	ImageName *uint16
+}
+
 //sys CimMountImage(imagePath string, fsName string, flags uint32, volumeID *g) (hr error) = cimfs.CimMountImage?
 //sys CimDismountImage(volumeID *g) (hr error) = cimfs.CimDismountImage?
 
 //sys CimCreateImage(imagePath string, oldFSName *uint16, newFSName *uint16, cimFSHandle *FsHandle) (hr error) = cimfs.CimCreateImage?
-//sys CimCloseImage(cimFSHandle FsHandle) = cimfs.CimCloseImage?
+//sys CimCreateImage2(imagePath string, flags uint32, oldFSName *uint16, newFSName *uint16, cimFSHandle *FsHandle) (hr error) = cimfs.CimCreateImage2?
+//sys CimCloseImage(cimFSHandle FsHandle) = cimfs.CimCloseImage
 //sys CimCommitImage(cimFSHandle FsHandle) (hr error) = cimfs.CimCommitImage?
 
 //sys CimCreateFile(cimFSHandle FsHandle, path string, file *CimFsFileMetadata, cimStreamHandle *StreamHandle) (hr error) = cimfs.CimCreateFile?
@@ -45,3 +51,8 @@ type CimFsFileMetadata struct {
 //sys CimDeletePath(cimFSHandle FsHandle, path string) (hr error) = cimfs.CimDeletePath?
 //sys CimCreateHardLink(cimFSHandle FsHandle, newPath string, oldPath string) (hr error) = cimfs.CimCreateHardLink?
 //sys CimCreateAlternateStream(cimFSHandle FsHandle, path string, size uint64, cimStreamHandle *StreamHandle) (hr error) = cimfs.CimCreateAlternateStream?
+//sys CimAddFsToMergedImage(cimFSHandle FsHandle, path string) (hr error) = cimfs.CimAddFsToMergedImage?
+//sys CimAddFsToMergedImage2(cimFSHandle FsHandle, path string, flags uint32) (hr error) = cimfs.CimAddFsToMergedImage2?
+//sys CimMergeMountImage(numCimPaths uint32, backingImagePaths *CimFsImagePath, flags uint32, volumeID *g) (hr error) = cimfs.CimMergeMountImage?
+//sys CimTombstoneFile(cimFSHandle FsHandle, path string) (hr error) = cimfs.CimTombstoneFile?
+//sys CimCreateMergeLink(cimFSHandle FsHandle, newPath string, oldPath string) (hr error) = cimfs.CimCreateMergeLink?